| 摘要 |
An optical scanning device for scanning a plurality of light beams on scanned surfaces, such as photosensitive drums, includes a light source, a front optical system, a deflector (e.g., a rotating polygon mirror) that scans the light beams in a main scanning direction, and a rear optical system for directing the light beams toward the scanned surfaces so that two of the light beams are parallel in a sub-scanning direction that is orthogonal to the main scanning direction and two of the light beams diverge in the sub-scanning direction in the rear optical system. The front optical system includes collimating and converging optical systems. The rear optical system includes cylindrical lens parts that are oppositely inclined relative to the optical axis in a plane that includes the sub-scanning direction so as to correct curvatures of the scanning lines.
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